Some results about complex powers of closed operators

Functional Analysis and Semi-Groups

Richard G. Cooke · Nature · 1949 · 1.9K citations

Natural Sciences, Chemistry, Topology +9

On the closedness of the sum of two closed operators

Giovanni Dore, Alberto Venni · Mathematische Zeitschrift · 1987 · 398 citations

Natural Sciences, Property Law, Layer Production +3

Separation of two (possibly unbounded) components of the spectrum of a linear operator

Giovanni Dore, Alberto Venni · Integral Equations and Operator Theory · 1989 · 10 citations

Natural Sciences, Neurological Surgery, Spectroscopy +8